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' 3 Sheets-Sheet 1.

(No Model.)

D. H. ERDMAN.

- PORTABLE HEATER.

No. 286,410. r Patented 001;. '9, 1883.

I 1 ll \ll \!1 M Fay? & WITNESSES VIP-JVE'NTOR A TTORA/EYS (No Model.) 3 ,Sheets-Sheet 2.

- D. H. ERDMAN.

PORTABLE HEATER. No. 286,410. Patented Oct. 9, 1883.

' ATTORNEYS N. vrrgns, Phwfoblbognpmr. Wish-hymn. 11

To all whom it may concern:

, floor.

heat-er. Fig. 2 is a plan view of the stand DANIEL H. ERDMAN, OF

. PATENT Orrrcn, a

CAMDEN, NElV JERSEY.

PORTABLE HEATER.

SPECIFICATION forming part of Letters Patent No. 286,410, dated October 9, 1883,

Q Application fil cd'l ebrnnrylil, 1883. (No model.)

Be it known that l", DANIEL H. ERDMAN, a citizen of the United States, residing at Gamden, in the county of Camden and State of New Jersey, have invented certain new and useful Improvements in Portable Heaters; and I do hereby declare the following tobe aful], clear, and exact description of the invention, reference being had to the accompanying drawings, which form part of this specification, in which- Figure 1 is a plan view of the base of the upon whichthe'heater rests. Fig. 3 is a rear elevation, partly in section, of the lower end of the heater and the stand; and Fig. 4 is a crosssection of the stand. Fig. 5 is a per-' spective view of the base of the heater, partially broken away.

My invention relates to heaters of that class known as portable hot-air heaters," and has for its object the provision of means whereby the incoming air will'be dispersed and distribut'ed equally over the entire surface of the firebox, thus supplying all the outgoing flucs with air of the same temperature It has for its further object the provision of means for elevating the heater above and isolating it from the floor beneath, thus guarding against accident by fire, so common where heateis are allowed'to rest directly upon the My invention consists in inserting in certain of the openings between the base orspac-e into which the cold air is first admitted and the air-flue surrounding the fire-box perforated or foraminated metal plates, which will obstruct the direct upward passage of the air and cause it to circulate around and distribute itself over the entire surface of the fire-box, and thus insure a uniform distribution of the heat to all the outgoingair-flues. In heaters of the ordinary construction it is found that the air entering the inlet-opening in the back of the bases flows into the air-flue directly above said opening without becoming sufficiently heated, a small portion only going forward to the front of the heater, and thence up the air-fines at that point. This I avoid by distributing the air so that it all becomes equally heated and distributed alike to all the air-fines of the furnace. r

The second part of my invention consists in a hollow annular base mounted upon legs made integral therewith, and provided withshects of metal that cover its central opening, the heater being mounted upon said base and thus elevated above and isolated from the floor.

Referring to theaccompanying drawings, A represents the casting which forms the base of the heater. The base A has a top, 13, in which is set the grate b, and upon which rest the firebox 0 and air dru1n D, their lower edges resting in grooves c and (2, respectively. Between the firebox O and the drum D plate B has a number of openings, 6, e", e, e, and 6 through which the air to be heated is admitted from the'base, an opening, E, in the back or side of the said base admitting air to its interior.

-The heater so far described is of the ordinary 7o construction,and ll make no claim to such, as my improvements are to be hereinafter fully set forth.

On top of the openings o c c, I place an equal number of perforated metal plates, f fflff, whose object is to obstruct, in some degree, the direct upward passage of the air from the opening E to the dues directly over said opening. The air not finding a free passage at e c e, the greater portion of it will pass around and emerge through c on one side and o on the other. It will there come in contact with the hottest portion of the firebox-i. a, that portion between the draft-opening and the door, and will be heated to a higher degree than if allowed to flow directly up into the flues at the back.

Vhile I have shown three perforated plates in position, more or less can be employed, if desired; or the plates may have holes graduo ally increasing in size from the center of plate 1' to the end of plates f and f, so that the air will pass through in gradually-increasing quantity from over the opening in the base to the front of the heater.

It is sometimes desirable or necessary to have the air-inlet at one side of the base, instead of at the back. In this case the plates are placed over the openings adjacent to and above said inlet, so as to cause a portion of the air to pass around the fire-box to the fines on the other side;

The heater, as above described, is mounted upon a supplemental stand, H, whose contour corresponds to that of the bottom of base A. The stand H consists of an annular casting having legs h h, which are made integral with or attached thereto.

I represents a plate of metal, which rests on top of stand H, so as to cover the interior opening of the same, and is held in place and prevented from moving laterally by flanges i i on the inside edge of the casting. The plate I is cut away at the edges, back of the flanges i, so as to leave openings k-k. Below the plate I is set and secured by bolts, rivets, or other suitable fastenings a second plate, I. Said plate is set a sufficient distance below the upper'one to leave an air-space, K, between them, openings ZZ in the lower plate and m m in the stand H, either or both, permitting the ingress of air, which, being heated by the radiation of heat from the upper plate, I, circulates between the plates and ascends up into the base A throughthe openings k k.

The advantages of the construction shown are briefly as follows: The cold air admitted through the opening in the base is prevented from flowing directly up the flue over said openning, and is caused to circulate around the ash pit and ascend all around-the fire-box, thus insuring its thorough heating before its admission to theflues leading to the various registers. The perforated plates, by means of which the air is distributed around the fire-box, being separable from the base, their number may be increased or diminished, according to cireumstances, or they may be removed altogether,

if desirable. The stand H is of use where it serving tocatch'any sparks that may fall down\ from the fire-box or ash-pit.

What I claim as my invention is as follows: 1. The combination, with the base A, firebox (J, and air-drum D, the latter having the top plate, B, with openings 6" e on one side of a diametrical line, of the perforated plates f f f, and constructed and adapted for insertion and arrangement between the fire-box and the drum, so as to partially impede the draft or passage of heated air to the flues above and cause the same to circulate around the drum, substantially as described.

2. The combination of stand II, having legs 71, h and metal plates I I having an air-space between them, and having the i11let-openings Z m and the outlet-openings 7a, with the heaterbase A, said stand and base being separable, substantially as and for the purpose described.

In testimony that I claim the foregoing I have hereunto set my hand this 15th day of February, 1883.

DANIEL H. ERDMAN.

Witnesses J os. 13. OoNNoL'LY, WM. II. POWELL. 

